Master Stormwater Management Plan Background

History

Major flood events in 1982 and 1987, and changing floodplain regulations, prompted the Village to create a comprehensive plan to address flooding in Northbrook. In 1993, the first Master Stormwater Management Plan was approved and looked at causes of flooding, property protection programs, and projects to improve flooding conditions. As a result of the first edition of the Master Stormwater Management Plan, the Village instituted the 50/50 Private Property Drainage Improvement Program as well as the construction of the Techny Drain Water Shed basin, the Dell Road detention basin, and Underwriters Laboratory Tributary project.

Historically Significant Rain Events In Chronological Order

*Denotes significant flooding event.

Date

Rainfall (in inches)

July 21 and 22, 1982

4.1

August 14, 1987*

7.75

June 13, 1999

2.41

September 28, 1999

2.01

September 11, 2000

2.52

September 19, 2001

3.98

October 13, 2001*

4.35

August 13, 2002

2.38

August 22, 2002

4.31

May 1, 2003

2.12

October 2, 2006

3.3

August 7, 2007

1.82

August 19, 2007

2.38

August 23, 2007

2.25

June 8, 2008

1.93

September 4, 2008

2.57

September 13, 2008*

6.4

March 8, 2009

1.86

June 19, 2009

3.35

August 27, 2009

1.85

May 13, 2010

2.2

July 23, 2011*

5.25

April 17 and 18, 2013*

4

June 26, 2013*

3.53

Recent Updates

Since that initial plan was drafted it has been updated three times. The first update came in 1996 and the second came in 2002. These 2 updated editions included updated costs and reflected projects that been completed as well as any conditions that may have changed. The two editions included projects that have been completed including the Underwriters Tributary and initial phases of the Techny Drain project. The two editions also recommended projects such as the rear yard drainage program and the overhead sewer program.

The third and most recent update of the Master Stormwater Management Plan was completed in the fall of 2011. The projects, programs, and recommendations included in the plan were created around the Village's 4 goals for managing stormwater, the MSMP will not eliminate flooding in the Village. The goals of the 2011 Master Stormwater Management Plan in order of priority are:

Recent Projects

With these goals, the plan includes in it 22 projects that are either regional or more locally/neighborhood based. In addition to these projects, 6 projects were added to the Master Stormwater Plan with the completion of Addendum 1 in April 2012. Each of these projects has a page providing information on cost, projected benefit, external factors affecting design and construction, and tentative timeline for construction.